The radio's CAT cable will do nothing whatsoever for you. If you
read the echolink manual it tells you just what you need.
Just as easy as reading it here!
Yes, and additionally, I recommend you look at
http://www.tigertronics.com for their little SignaLink interface box.
Its about half the price of other interface boxes and works well on an
Echolink node.
Ed WB6SAT